Vacuum exhaust-pipe



D. HARRIG-AN. Vacuum Exhaust Pipe.

(No Model.)

Patented April 19,1881.

N.FETERS, PHOTQLITHOGRAPHER. WASHINGTON. D. C.

- from the cylinder-the steam passes up through UNITED STATES,

PATENT OFFICE.

DENNIS HARRIGAN, OF SOMEBVILLE, MASSACHUSETTS.

VACUUM EXHAUST-PIPE.

SPECIFICATION forming part of Letters Patent No. 240,249, dated April 19, 1881.

Application filed December 9, 1880.

To all whom it may concern:

Be it known that I, DENNIS HARRIGAN, of Somerville, in the county of Mid dlesex and State of Massachusetts, have invented a new and useful Improvement in Vacuum Exhaust- Pipes for Locomotives and other Engines, of which the following is a specification.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is an elevation of the exhaust. Fig. 2 is a plan view, with the tips removed and turned over, thus exhibiting their under sides. Fig. 3 is a longitudinal vertical section.

a a are the two exhaust-pipes, through which the steam passes after leaving the cylinders.

12 b are the casings.

0 c are chambers surrounding the pipes to a, and at their upper portions made very narrow, but still surrounding the pipes, and connecting with the tips 61 d, which are provided with openings d.

e is a passage, which forms an internal connection between the two chambers c 0. I

ff are pipes, each of which leads from the annular groove or channel g in the upper surface of the casing of one pipe to the chamber surrounding the other pipe. Corresponding with the grooves g g in the casings are channels gg in the tips and opening on their inner sides into the upper portions, 0', of the chambers.

The operation is as follows: Supposing the pipe a to be exhausting-"i. 0., taking dead steam said pipe at, and thence a part of it out through the tip 01. The rest of the steam passesinto the upper portion, 0', of the chamber 0 thence either through thepassageeor through channels g g and passage f into the larger portion of the opposite chamber 0; thenceitpasses'up through the narrow portion 0 of chamber 0 out throu h tip 01. The portion 0" being so small the steam passes through it with great force, thus creating a vacuum in the pipe a, (the one that is i (No model.)

not exhausting,) hence drawing the piston of the cylinder and assisting in propelling the engine. When the pipe ais exhausting the effect above described is produced in the other pipe, a.

The pipe h connects the two chambers c c externally. By this means steam can be taken from any portion of the boiler and conducted into the spaces 0 c to operate the exhaust-pipe or sucker. Another advantage is that the exhaust may be used to prevent the engine from sucking sparks or cinders While in motion. This is done by taking steam from the boiler through pipe it into the chambers and blowing away the sparks.

A branch pipe may pass-from the pipe connecting with the boiler to the pipe conveying steam to the cylinder, with a check-valve to purpose of creating a vacuum in the pipe not exhausting, substantially as and for the purpose set forth.

2. In combination with the pipes at a, surrounded by chambers c c c c, the casings b I), provided with the grooves g g, and the tips at at, having the channels g g of the pipes f f h, arranged and constructed substantially as and for the purposes described.

DENNIS HARRIGAN.

Witnesses:

HENRY W. WILLIAMS, GEORGE V. MALLON.

Ml V l 

